Carbureter.



A. c. STEWART.

OARBURETBR. `APPLICATION FILED JULY13, 1910.

1,059,501 .Patented Apr. 22, 1913.

new: Imm. Incl, Llmov.. Maligno. D4 C,

UNITED l STATES PATENT OFFICEl.`

ALFRED C. STEWART, OF LOS ANGELES, CALIFORNIA.

oAnnUnErER.

Specification of Letters Patent.

Original application filed April 27, 1908, Serial No. 429,583. Dividedand this application filed July 13, 1910. Serial No. 571,855.

To all whom 1' t may concern Be it known that l, Ummm C. Simmer,- acitizen of `the United States, residing at Los Angeles, in the county ofLos Angeles and State of Calitor11ia,havc invented a new and useful(larlmreter, of which the following is a specification. p

The subject matter of the present application. was shown and described,but not claimed, 'in my application Serial No. 429563, filed April27th.4 1908, of which this application is a division and continuation.

The main object of the present invention is to provide improved means fe.admit-ting gasolene or oil to the mixture chamber ot the carburetorunder the control of a valve operated automatically by the suction otthe engine.

Other objects of the invention will appear' hereinafter.`

The accompanying drawings illustrate the invention and referringthereto: Figure 1 is avertical section of the carbureter. Fig.` 2a sideelevation thereof. Fig. 3 a horizontal section on the line S-s in Fig.1.

The casing 1 is formed with superimposed oil, air inlet and suction oroutlet chambers 2, 3, 4 and `tuel is supplied to the oil chamber`througha. pipe 5, whose outletV is controlled by a valve 6earried by allever 7, operated by a float `8 in the oil chamber, to maintain adefinite level of oil therein. Valve 6 is in a chamber 2 openinglaterally from oil chamber 2. Valve member 9,

`Whose conical face corresponds with and rests onthe u Wardly'laringwall 4 of the suction cham r has a stem 10 working freely in a guidetube 11, the stem having 4an `extension 12 passing loosely through an 4ol opening 13 `in the bot-tom of the tube 11, so as `to allowrestricted'passage of oil, the tube serving as a dash pot for the valveV stem,which Works as a piston thereon. Said stem is formed with an interiorchamber 14, forming an oil reservoir, communicating with the oil chamberthrougf. a bore 15 in the'e'xtension 12, and an ad)astable needle valve16 screwing through the bottom of oil chambery 2 has a looseneedle 25which pro jects into this boreto control flow of oil therethrough.Interior chamber 14; also communicates through an opening 17 with achannel 18 in the Wall of tube 11, said channel surrounding thevalvestem 10 and cornmunicating through opening` 19 with the upper` partot oil chamber 2, which is Open to eommunieation with the outer airby anopening,r 20. A tube 2l screws into a screw thrtauled bore ot'` thevalve men'iber 9, and extends down into inner chamber 14;, the upper endof said tube havinga bulb 23 and constrictcd opening 24 for atomizationof the oil. By turning tube 21 the distance of its lower end from thebottom ot chamber 111; may be adjusted. lVhen the engine is at rest theoil will be at the sanic height in the interior chamber 1t as in the oilchamber, and will extend above the bott-om oi tube 2l, and when theengine starts the fluid will be sucked up through tube 2l until thelevel tails to the bottom ot'. said tube, thus flushing the carburetorto temporarily enrich the mixture. ln normal operation, the suction issuilieient to break any liquid seal that` may form at the bottom of tube21, and to keep the oil level at the bottom ot said tube., and theamount ot oil supplied is determined by the head or difference in level.between the bottom of tube 21 and the oil in chamber 2, and enough airwill pass in through openings 20,19. 17 to pass up with the oil throughtube 21 to provide air in proper amount for ejeeting the oil from thewell as required for steady running. for example at maximum output(incapacity. this being deterw mined by the size ot opening 17. Thechannel 1S prevents sucking ofgasolene up` through the space between thestem and the tube', so that the, stem may work freely and with slightfriction in the tube without leak` age ot gasolcne into the air inletchamber 3. As the valve member 9 rises, it varies the height of tube 21and thus diminishes the feeding head,`but this may be compensated i byproperly shaping the valve needle 25 of valve 16,4 said needle beingtapered in such manner that? in the elevation of the tube 12 the openingbetween the needle and `said tube increases sufficiently to compensatefor this loss of head.

Throttle 26 controls admission ot air to air inlet chamber 3 and by itsclosure regulates the suction and air oil feed. Y

The above described construction provides a carburetor in which the oilis supplied to the mixture chamber in the most advantageous manner as itrises to the center of the v alve and is distributed equally in alldirections. By the provision of the central looselv mounted valve`member 25, I am enabled to `use thewalve `stem .of the air valve as themeanszfor controlling theoil .supply,' the' i said member 25 adjusting.itself automati- 4 callyto anyjua'ccuraoy in centering the parts, lsuchas 41s hable to arisem such a construc- Tube21, .iwellvlandfboreconstitute'av passa e 'for establishing communication from theneedle'valve 25 is' adjustable longitudinall in said passage to controladmissi'onof oilt erethroughand,bein loosely mounted,

le' movable laterally in said opening toad# just itself thereto.' What Iclaimis'f: f

1.' In acarburetegn casing provided with' a mlxture chamber, air inletmeans, an oil chamberya 'valve controlling communication from saidairlinlet means to said mixture chamber, anrhprovided with a passage or'establishing communication from said oil chamber to said mixturechamber, said valve 4being movable in responseto the suction ,in

'the mixture chamber to control the admisy 4sion of oil thereto,iand alongitudinally adjustable member coperating with said passagein saidvalve to control admission oi' oil therethrough, said longitudinallyadjustable member being `mounted to move laterally 'withinsaid openingto adjust itself thereto.

2.r In a carburetenav casing provided with `a mlxture chamber, air inletmeans `and an oilchamber, a tube extending .within said casing, a valvecontrolling communication of air from said air inlet means to saidmixture chamber, said valve having a stem'slidably mounted in saidtube,said valve and valve stem being formed Witha passageV commu#:nicating at-its lower end with the oil chamber, and communlcatlng` atits vupper end Gopies. of this patent may be obtained for five centscach, by addressing Washington, D. C.

chamberto the mixture chamber, and

Loaaeoi with-the mixture chamber, and avalve adjustably mounted in thebottom of the cas- 111g, and coperatingwith'the llower end of saldpassage to control lSupply of oil therethrough, said tube being providedwith vmeans for admission of oil thereto, and said valve stem Working asa' piston therein, whereby thetube serves as ak dash pot for the valve.

i 3. In a carbureter for internal combustionI engines, the combinationof a casing having an'fai'r inlet, a vertically movable Weighted valvewhich is operated automatically by the. enginesu'ction and controlstheadmi'ssion of` air tothe carbureter, said valve having a hollow'stemforming a` gasolene supply passage Which is movable with said valve, a

valve which cooperates with saidv passage for aregulating the supply ofgasolene, and

means for steadying the movement of said l Weighted valve,substantially-as set forth.

v 4.-. In a carbureter vfor internal "combustion" engines, thecombination of a mixing chamber, a gasolene chamber, a Weighted valvewhich is operated .automatically by'. the-err;

gine suction andcontrols the admission of air to the mixing chamber,lsaid valve having` a stem with a l asolene passage entering thegasolene cham er and4 a connecting d1s-` charge duct, meanscoperatlngwith said 4passage in the valve stem for regulating the y ifeed of the gasolene, and means coperating,

the Commissioner of Qatent,

